Ok, I have been leaning towards pixels and Dumbs over the renard system, though after seeing dave's display tonight, i could still go the renard way. Anyways that's not the issue here... The 2 port version says it can control 4 universes of 170 pixels, does that mean the 8 handles 16 universes and the 12 24? For a 2.5 metre arch, what sort of pixel spacing would you suggest, or would you use the strip type? I'm think of going a 2 port version to build my first item, the leaping arches, but I'm really worried how bright the led are. I'm heading down to port Kennedy sat night to have a look at the display. I was also then thinking of getting a ray wu 27 channel for my dumbies to build the likes of snowmen etc. Thanks in advance for any help, I've found this site ultra informative.